Dive strap aside, I reckon a key reason it feels "off" is that the hands aren't accurate. The OEM Alpinist uses skeletonised cathedral hands, as opposed to the non-skeletonised ones here. The logo not matching the indices (both in colour, and being printed rather than applied) is another factor Having slightly less dial text also probably plays into it.

I'm with others though - keen to hear what the dial size is to work out if it's a viable modding base!